


document.onmousemove = function(evt){
     var e = evt || window.event
     console.log(e.pageY );
     //e.page 是什么形式的
     var beeObj = document.querySelector('div')
     beeObj.style.left = e.pageX - beeObj.offsetWidth/2 + 'px'
     beeObj.style.top = e.pageY - beeObj.offsetHeight/2 +  'px'
}
